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Proceedings Paper

Self-tracking concentrator based on switchable transparency and rejected-ray recycling
Author(s): Harry N. Apostoleris; Matteo Chiesa; Marco Stefancich
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Paper Abstract

We present and analyze a design for a self-tracking solar concentrator based on a switchable-transparency optical element. The switchable element forms a moving aperture that tracks the motion of the sun to admit light into a CPC in which rays are 'recycled,' undergoing many passes through the concentrator to increase the absorption probability. This design has the benefit of not requiring any control of the angular profile of internal radiation, in contrast to other design that rely on total internal reflection to confine and transport the light. Via probabilistic models and rigorous ray tracing, we show that this design can exhibit performance comparable to other self-tracking designs. In particular we demonstrate a system with a 70x geometric concentration ratio and a tracking range of ±20°, achieving optical efficiencies of up to 65%.

Paper Details

Date Published: 25 August 2015
PDF: 6 pages
Proc. SPIE 9572, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XII, 95720A (25 August 2015); doi: 10.1117/12.2187779
Show Author Affiliations
Harry N. Apostoleris, Masdar Institute of Science and Technology (United Arab Emirates)
Matteo Chiesa, Masdar Institute of Science and Technology (United Arab Emirates)
Marco Stefancich, National Research Council (Italy)


Published in SPIE Proceedings Vol. 9572:
Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XII
Roland Winston; Jeffrey M. Gordon, Editor(s)

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